Prevailing torque type steel nuts. Mechanical and performance properties

Prevailing torque type steel nuts. Mechanical and performance properties

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1   Scope

This International Standard specifies the mechanical and performance properties for prevailing torque type steel nuts when tested at an ambient temperature range of +10 °C to +35 °C. It includes a single test to determine the prevailing torque properties (performance properties) and/or the torque/clamp force properties.
This International Standard applies to prevailing torque all metal type nuts and prevailing torque non-metallic insert type nuts:
  1. a) with triangular ISO thread according to ISO 68-1;
  2. b) with diameter/pitch combination according to ISO 261 and ISO 262;
  3. c) with coarse pitch thread M3 to M39 and mechanical properties according to ISO 898-2;
  4. d) with fine pitch thread M8×1 to M39×3 and mechanical properties according to ISO 898-6;
  5. e) within the temperature range of -50 °C to +150 °C for prevailing torque all metal type nuts;

    NOTE 1 See Clause 7, paragraph 3.

  6. f) within the temperature range of -50 °C to +120 °C for prevailing torque non-metallic insert type nuts.

    NOTE 2 See Clause 7, paragraph 4.